exam Maths Puzzle Numerical Ability

How many ounces of a 10% baking soda solution must be added to 40 ounces of 2% baking soda solution to make a 5% baking soda solution?

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exam Other Question

(a+3a^2+2a^3)-(a^4-a^3) Hi, I need help finding the domain and range for this piecewise defined function
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f(x) = { x + 6,{{{ x <= -4 }}} }
......{ x + 10,{{{ -4<x<8 }}}
......{ 30, {{{ x >= 8 }}} }